Portion of a rear light for a motor vehicle



FIG. 1 is a first perspective view of a portion of a rear light for motor vehicle;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The portion shown by broken lines is for illustrative purposes only and forms no part of the claimed design. The dashed lines show a borderline between the claimed design and other portion. 

The ornamental design for a portion of a rear light for motor vehicle, as shown and described. 